Optical imaging lens

ABSTRACT

Present embodiments provide for an optical imaging lens. The optical imaging lens comprises a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element positioned in an order from an object side to an image side. Through controlling the convex or concave shape of the surfaces of the lens elements and designing parameters satisfying at least one inequality, the optical imaging lens shows better optical characteristics and enlarge field angle the total length of the optical imaging lens is shortened.

RELATED APPLICATION

This application claims priority from China Patent Application No.201610252361.4, filed on Apr. 21, 2016, the contents of which are herebyincorporated by reference in their entirety for all purposes.

TECHNICAL FIELD

The present disclosure relates to an optical imaging lens, andparticularly, to an optical imaging lens having six lens elements.

BACKGROUND

Technology improves every day, continuously expanding consumer demandfor increasingly compact electronic devices. This applies in the contextof telephoto lens characteristics, in that key components for opticalimaging lenses incorporated into consumer electronic products shouldkeep pace with technological improvements in order to meet theexpectations of consumers expectations. Some important characteristicsof an optical imaging lens include image quality and size. Improvementsin image sensor technology play an important role in raising consumerexpectations related to image quality. However, reducing the size of theimaging lens while achieving good optical characteristics presentschallenging problems. For example, in a typical optical imaging lenssystem having six lens elements, the distance from the object sidesurface of the first lens element to the image plane along the opticalaxis is too large to accommodate the slim profile of today's cell phonesor digital cameras. Decreasing the dimensions of an optical lens whilemaintaining good optical performance may not only be achieved by scalingdown the lens. Rather, these benefits may be realized by improving otheraspects of the design process, such as by varying the material used forthe lens, or adjusting the assembly yield.

In this manner, there is a continuing need for improving the designcharacteristics of small sized optical lenses. Achieving theseadvancements may require overcoming unique challenges, even whencompared to design improvements for traditional optical lenses. However,refining aspects of the optical lens manufacturing process that resultin a lens that meets consumer demand and provides upgrades to imagingquality are always desirable objectives for industries, governments, andacademia.

SUMMARY

The present disclosure provides for an optical imaging lens. Bycontrolling the convex or concave shape of the surfaces of each lenselement and the parameters in at least two equations, the length of theoptical imaging lens may be shortened while maintaining good opticalcharacteristics and system functionality.

In some embodiments, an optical imaging lens may comprise sequentiallyfrom an object side to an image side along an optical axis, a first,second, third, fourth, fifth and sixth lens elements and a filteringunit. Each of the first, second, third, fourth, fifth and sixth lenselements may have refracting power. Additionally, the optical imaginglens may comprise an object-side surface facing toward the object side,an image-side surface facing toward the image side, and a centralthickness defined along the optical axis.

In some embodiments, the optical imaging lens may further comprise anaperture stop positioned between the object and the first lens element,two adjacent lens elements or the sixth lens element and the imageplane, such as glare stop or field stop, which may provide a reductionin stray light that is favorable for improving image quality.

In some embodiments, in the optical imaging lens of the presentdisclosure, the aperture stop can be positioned between the object andthe first lens element as a front aperture stop or between the firstlens element and the image plane as a middle aperture stop. If theaperture stop is the front aperture stop, a longer distance between theexit pupil of the optical imaging lens for imaging pickup and the imageplane may provide the telecentric effect and may improve the efficiencyof receiving images by the image sensor, which may comprise a CCD orCMOS image sensor. If the aperture stop is a middle aperture stop, theview angle of the optical imaging lens may be increased, such that theoptical imaging lens for imaging pickup has the advantage of awide-angle lens.

In the specification, parameters used herein may include:

Parameter Definition TA The distance between the aperture stop and theobject-side surface of the adjacent lens element along the optical axisT1 The central thickness of the first lens element along the opticalaxis G12 The distance between the image-side surface of the first lenselement and the object-side surface of the second lens element along theoptical axis/The air gap between the first lens element and the secondlens element along the optical axis T2 The central thickness of thesecond lens element along the optical axis G23 The air gap between thesecond lens element and the third lens element along the optical axis T3The central thickness of the third lens element along the optical axisG34 The air gap between the third lens element and the fourth lenselement along the optical axis T4 The central thickness of the fourthlens element along the optical axis G45 The air gap between the fourthlens element and the fifth lens element along the optical axis T5 Thecentral thickness of the fifth lens element along the optical axis G56The air gap between the fifth lens element and the sixth lens elementalong the optical axis T6 The central thickness of the sixth lenselement along the optical axis G6F The distance between the image-sidesurface of the sixth lens element and the object-side surface of thefiltering unit along the optical axis TF The central thickness of thefiltering unit along the optical axis GFP The distance between theimage-side surface of the filtering unit and an image plane along theoptical axis f1 The focusing length of the first lens element f2 Thefocusing length of the second lens element f3 The focusing length of thethird lens element f4 The focusing length of the fourth lens element f5The focusing length of the fifth lens element f6 The focusing length ofthe sixth lens element n1 The refracting index of the first lens elementn2 The refracting index of the second lens element n3 The refractingindex of the third lens element n4 The refracting index of the fourthlens element n5 The refracting index of the fifth lens element n6 Therefracting index of the sixth lens element v1 The Abbe number of thefirst lens element v2 The Abbe number of the second lens element v3 TheAbbe number of the third lens element v4 The Abbe number of the fourthlens element v5 The Abbe number of the fifth lens element v6 The Abbenumber of the sixth lens element HFOV Half Field of View of the opticalimaging lens Fno F-number of the optical imaging lens EFL The effectivefocal length of the optical imaging lens TTL The distance between theobject-side surface of the first lens element and an image plane alongthe optical axis/The length of the optical image lens ALT The sum of thecentral thicknesses of all lens elements Gaa The sum of all air gapsbetween all lens elements along the optical axis BFL The back focallength of the optical imaging lens/The distance from the image- sidesurface of the last lens element to the image plane along the opticalaxis TL The distance from the object-side surface of the first lenselement to the image- side surface of the lens element adjacent to theimage plane along the optical axis Gmax The maximum value of the airgaps between two adjacent lens elements of the first lens element to thesixth lens element

According to some embodiments of the optical imaging lens of the presentdisclosure, the first lens element may have positive refracting power;the object-side surface of the second lens element may comprise a convexportion in a vicinity of a periphery of the second lens element; theobject-side surface of the third lens element may comprise a convexportion in a vicinity of a periphery of the third lens element; thematerial of the fourth lens element may be plastic; the material of thefifth lens element may be plastic; the object-side surface of the sixthlens element may comprise a concave portion in a vicinity of a peripheryof the sixth lens element; the image-side surface of the sixth lenselement may comprise a convex portion in a vicinity of a periphery ofthe sixth lens element; and the optical imaging lens may comprise noother lenses having refracting power beyond the six lens elements.

In another exemplary embodiment, other equation(s), such as thoserelating to the ratio among parameters could be taken intoconsideration. For example, EFL and TTL could be controlled to satisfythe equation as follows:

EFL/TTL≧1  Equation (1); and

TTL and Gmax could be controlled to satisfy the equation as follows:

TTL/Gmax≦7.65  Equation (2).

Alternatively, other parameters could be taken into consideration. Forexample, BFL, T2 and G56 could be controlled to satisfy the equation asfollows:

BFL/(T2+G56)≧1.5  Equation (3);

EFL and T4 could be controlled to satisfy the equation as follows:

EFL/T4≧8.5  Equation (4);

BFL, G23 and G56 could be controlled to satisfy the equation as follows:

BFL/(G23+G56)≧1.5  Equation (5);

TTL and T4 could be controlled to satisfy the equation as follows:

TTL/T4≧9  Equation (6);

G34, T5 and T6 could be controlled to satisfy the equation as follows:

(G34+T5)/T6≦11.5  Equation (7);

T3, G34 and T6 could be controlled to satisfy the equation as follows:

(T3+G34)/T6≦11.5  Equation (8);

G34 and T6 could be controlled to satisfy the equation as follows:

G34/T6≦7.5  Equation (9);

T2, T5 and T6 could be controlled to satisfy the equation as follows:

(T2+T5)/T6≦6  Equation (10);

Gmax and G23 could be controlled to satisfy the equation as follows:

Gmax/G23≧2.5  Equation (11);

G12, T3 and T6 could be controlled to satisfy the equation as follows:

(G12+T3)/T6≦6.5  Equation (12);

G45, G56 and T6 could be controlled to satisfy the equation as follows:

(G45+G56)/T6≦10  Equation (13);

G34 and T6 could be controlled to satisfy the equation as follows:

(G34+T6)/T6≦8.5  Equation (14);

T2, G45 and T6 could be controlled to satisfy the equation as follows:

(T2+G45)/T6≦7.5  Equation (15);

Gmax, G12 and G23 could be controlled to satisfy the equation asfollows:

Gmax/(G12+G23)≧2.5  Equation (16);

ALT, G12 and T6 could be controlled to satisfy the equation as follows:

ALT/(G12+T6)≦11  Equation (17);

Gaa, T2 and T6 could be controlled to satisfy the equation as follows:

Gaa/(T2+T6)≦5.5  Equation (18);

TTL, T3 and T6 could be controlled to satisfy the equation as follows:

TTL/(T3+T6)≦6.5  Equation (19);

EFL, T3 and G23 could be controlled to satisfy the equation as follows:

EFL/(G23+T3)≧5.5  Equation (20);

G12, T6 and T2 could be controlled to satisfy the equation as follows:

(G12+T6)/T2≧2  Equation (21);

T2, T3 and T6 could be controlled to satisfy the equation as follows:

(T2+T3)/T6≦10.5  Equation (22);

G23, G45 and T6 could be controlled to satisfy the equation as follows:

(G23+G45)/T6≦10  Equation (23);

BFL, G23 and T4 could be controlled to satisfy the equation as follows:

BFL/(G23+T4)≧1  Equation (24); or

G23, G23 and T6 could be controlled to satisfy the equation as follows:

(G23+T6)/G23≧2  Equation (25).

Aforesaid embodiments are not limited and could be selectivelyincorporated in other embodiments described herein. In some embodiments,more details about the convex or concave surface structure could beincorporated for one specific lens element or broadly for plural lenselements to enhance the control for the system performance and/orresolution. It is noted that the details listed here could beincorporated into example embodiments if no inconsistency occurs.

By controlling the convex or concave shape of the surfaces, exemplaryembodiments of the optical imaging lens systems herein achieve goodoptical characteristics, provide an enlarged aperture, reduce the fieldof view, increase assembly yield, and effectively shorten the length ofthe optical imaging lens.

BRIEF DESCRIPTION OF THE DRAWINGS

Exemplary embodiments will be more readily understood from the followingdetailed description when read in conjunction with the appended drawing,in which:

FIG. 1 depicts a cross-sectional view of one single lens elementaccording to the present disclosure;

FIG. 2 depicts a schematic view of the relation between the surfaceshape and the optical focus of the lens element;

FIG. 3 depicts a schematic view of a first example of the surface shapeand the efficient radius of the lens element;

FIG. 4 depicts a schematic view of a second example of the surface shapeand the efficient radius of the lens element;

FIG. 5 depicts a schematic view of a third example of the surface shapeand the efficient radius of the lens element;

FIG. 6 depicts a cross-sectional view of a first embodiment of anoptical imaging lens having six lens elements according to the presentdisclosure;

FIG. 7 depicts a chart of longitudinal spherical aberration and otherkinds of optical aberrations of a first embodiment of the opticalimaging lens according to the present disclosure;

FIG. 8 depicts a table of optical data for each lens element of theoptical imaging lens of a first embodiment of the present disclosure;

FIG. 9 depicts a table of aspherical data of a first embodiment of theoptical imaging lens according to the present disclosure;

FIG. 10 depicts a cross-sectional view of a second embodiment of anoptical imaging lens having six lens elements according to the presentdisclosure;

FIG. 11 depicts a chart of longitudinal spherical aberration and otherkinds of optical aberrations of a second embodiment of the opticalimaging lens according the present disclosure;

FIG. 12 depicts a table of optical data for each lens element of theoptical imaging lens of a second embodiment of the present disclosure;

FIG. 13 depicts a table of aspherical data of a second embodiment of theoptical imaging lens according to the present disclosure;

FIG. 14 depicts a cross-sectional view of a third embodiment of anoptical imaging lens having six lens elements according to the presentdisclosure;

FIG. 15 depicts a chart of longitudinal spherical aberration and otherkinds of optical aberrations of a third embodiment of the opticalimaging lens according the present disclosure;

FIG. 16 depicts a table of optical data for each lens element of theoptical imaging lens of a third embodiment of the present disclosure;

FIG. 17 depicts a table of aspherical data of a third embodiment of theoptical imaging lens according to the present disclosure;

FIG. 18 depicts a cross-sectional view of a fourth embodiment of anoptical imaging lens having six lens elements according to the presentdisclosure;

FIG. 19 depicts a chart of longitudinal spherical aberration and otherkinds of optical aberrations of a fourth embodiment of the opticalimaging lens according the present disclosure;

FIG. 20 depicts a table of optical data for each lens element of theoptical imaging lens of a fourth embodiment of the present disclosure;

FIG. 21 depicts a table of aspherical data of a fourth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 22 depicts a cross-sectional view of a fifth embodiment of anoptical imaging lens having six lens elements according to the presentdisclosure;

FIG. 23 depicts a chart of longitudinal spherical aberration and otherkinds of optical aberrations of a fifth embodiment of the opticalimaging lens according the present disclosure;

FIG. 24 depicts a table of optical data for each lens element of theoptical imaging lens of a fifth embodiment of the present disclosure;

FIG. 25 depicts a table of aspherical data of a fifth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 26 depicts a cross-sectional view of a sixth embodiment of anoptical imaging lens having six lens elements according to the presentdisclosure;

FIG. 27 depicts a chart of longitudinal spherical aberration and otherkinds of optical aberrations of a sixth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 28 depicts a table of optical data for each lens element of a sixthembodiment of an optical imaging lens according to the presentdisclosure;

FIG. 29 depicts a table of aspherical data of a sixth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 30 depicts a cross-sectional view of a seventh embodiment of anoptical imaging lens having six lens elements according to the presentdisclosure;

FIG. 31 depicts a chart of longitudinal spherical aberration and otherkinds of optical aberrations of a seventh embodiment of the opticalimaging lens according to the present disclosure;

FIG. 32 depicts a table of optical data for each lens element of theoptical imaging lens of a seventh embodiment of the present disclosure;

FIG. 33 depicts a table of aspherical data of a seventh embodiment ofthe optical imaging lens according to the present disclosure;

FIG. 34 depicts a cross-sectional view of an eighth embodiment of anoptical imaging lens having six lens elements according to the presentdisclosure;

FIG. 35 depicts a chart of longitudinal spherical aberration and otherkinds of optical aberrations of an eighth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 36 depicts a table of optical data for each lens element of theoptical imaging lens of an eighth embodiment of the present disclosure;

FIG. 37 depicts a table of aspherical data of an eighth embodiment ofthe optical imaging lens according to the present disclosure;

FIG. 38 depicts a cross-sectional view of a ninth embodiment of anoptical imaging lens having six lens elements according to the presentdisclosure;

FIG. 39 depicts a chart of longitudinal spherical aberration and otherkinds of optical aberrations of a ninth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 40 depicts a table of optical data for each lens element of theoptical imaging lens of a ninth embodiment of the present disclosure;

FIG. 41 depicts a table of aspherical data of a ninth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 42 depicts a cross-sectional view of a tenth embodiment of anoptical imaging lens having six lens elements according to the presentdisclosure;

FIG. 43 depicts a chart of longitudinal spherical aberration and otherkinds of optical aberrations of a tenth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 44 depicts a table of optical data for each lens element of theoptical imaging lens of a tenth embodiment of the present disclosure;

FIG. 45 depicts a table of aspherical data of a tenth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 46 depicts a cross-sectional view of an eleventh embodiment of anoptical imaging lens having six lens elements according to the presentdisclosure;

FIG. 47 depicts a chart of longitudinal spherical aberration and otherkinds of optical aberrations of an eleventh embodiment of the opticalimaging lens according to the present disclosure;

FIG. 48 depicts a table of optical data for each lens element of theoptical imaging lens of an eleventh embodiment of the presentdisclosure;

FIG. 49 depicts a table of aspherical data of an eleventh embodiment ofthe optical imaging lens according to the present disclosure;

FIG. 50 depicts a cross-sectional view of a twelfth embodiment of anoptical imaging lens having six lens elements according to the presentdisclosure;

FIG. 51 depicts a chart of longitudinal spherical aberration and otherkinds of optical aberrations of a twelfth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 52 depicts a table of optical data for each lens element of theoptical imaging lens of a twelfth embodiment of the present disclosure;

FIG. 53 depicts a table of aspherical data of a twelfth embodiment ofthe optical imaging lens according to the present disclosure;

FIG. 54A and FIG. 54B are tables for the values of EFL, TL, BFL, TTL,Gmax, ALT, Gaa, EFL/TTL, TTL/Gmax, BFL/(T2+G56), EFL/T4, BFL/(G23+G56),TTL/T4, (G34+T5)/T6, (T3+G34)/T6, G34/T6, (T2+T5)/T6, Gmax/G23,(G12+T3)/T6, (G45+G56)/T6, (G34+T6)/T6, (T2+G45)/T6, Gmax/(G12+G23),ALT/(G12+T6), Gaa/(T2+T6), TTL/(T3+T6), EFL/(G23+T3), (G12+T6)/T2,(T2+T3)/T6, (G23+G45)/T6, BFL/(G23+T4) and (G23+T6)/G23 of the first totwelfth example embodiments.

DETAILED DESCRIPTION

For a more complete understanding of the present disclosure and itsadvantages, reference is now made to the following description taken inconjunction with the accompanying drawings, in which like referencenumbers indicate like features. Persons having ordinary skill in the artwill understand other varieties for implementing example embodiments,including those described herein. The drawings are not limited tospecific scale and similar reference numbers are used for representingsimilar elements. As used in the disclosures and the appended claims,the terms “example embodiment,” “exemplary embodiment,” and “presentembodiment” do not necessarily refer to a single embodiment, although itmay, and various example embodiments may be readily combined andinterchanged, without departing from the scope or spirit of the presentdisclosure. Furthermore, the terminology as used herein is for thepurpose of describing example embodiments only and is not intended to bea limitation of the disclosure. In this respect, as used herein, theterm “in” may include “in” and “on”, and the terms “a”, “an” and “the”may include singular and plural references. Furthermore, as used herein,the term “by” may also mean “from”, depending on the context.Furthermore, as used herein, the term “if” may also mean “when” or“upon”, depending on the context. Furthermore, as used herein, the words“and/or” may refer to and encompass any and all possible combinations ofone or more of the associated listed items.

In the present specification, the description “a lens element havingpositive refracting power (or negative refractive power)” means that theparaxial refractive power of the lens element in Gaussian optics ispositive (or negative). The description “An object-side (or image-side)surface of a lens element” may include a specific region of that surfaceof the lens element where imaging rays are capable of passing throughthat region, namely the clear aperture of the surface. Theaforementioned imaging rays can be classified into two types, chief rayLc and marginal ray Lm. Taking a lens element depicted in FIG. 1 as anexample, the lens element may be rotationally symmetric, where theoptical axis I is the axis of symmetry. The region A of the lens elementis defined as “a part in a vicinity of the optical axis”, and the regionC of the lens element is defined as “a part in a vicinity of a peripheryof the lens element”. Besides, the lens element may also have anextending part E extended radially and outwardly from the region C,namely the part outside of the clear aperture of the lens element. Theextending part E may be used for physically assembling the lens elementinto an optical imaging lens system. Under normal circumstances, theimaging rays would not pass through the extending part E because thoseimaging rays only pass through the clear aperture. The structures andshapes of the aforementioned extending part E are only examples fortechnical explanation, the structures and shapes of lens elements shouldnot be limited to these examples. Note that the extending parts of thelens element surfaces depicted in the following embodiments arepartially omitted.

The following criteria are provided for determining the shapes and theparts of lens element surfaces set forth in the present specification.These criteria mainly determine the boundaries of parts under variouscircumstances including the part in a vicinity of the optical axis, thepart in a vicinity of a periphery of a lens element surface, and othertypes of lens element surfaces such as those having multiple parts.

FIG. 1 depicts a radial cross-sectional view of a lens element. Beforedetermining boundaries of those aforesaid parts, two referential pointsshould be defined first, the central point and the transition point. Thecentral point of a surface of a lens element is a point of intersectionof that surface and the optical axis. The transition point is a point ona surface of a lens element, where the tangent line of that point isperpendicular to the optical axis. Additionally, if multiple transitionpoints appear on one single surface, then these transition points aresequentially named along the radial direction of the surface withnumbers starting from the first transition point. For instance, thefirst transition point (closest one to the optical axis), the secondtransition point, and the Nth transition point (farthest one to theoptical axis within the scope of the clear aperture of the surface). Thepart of a surface of the lens element between the central point and thefirst transition point is defined as the part in a vicinity of theoptical axis. The part located radially outside of the Nth transitionpoint (but still within the scope of the clear aperture) is defined asthe part in a vicinity of a periphery of the lens element. In someembodiments, there are other parts existing between the part in avicinity of the optical axis and the part in a vicinity of a peripheryof the lens element; the numbers of parts depend on the numbers of thetransition point(s). In addition, the radius of the clear aperture (or aso-called effective radius) of a surface is defined as the radialdistance from the optical axis I to a point of intersection of themarginal ray Lm and the surface of the lens element.

Referring to FIG. 2, determining the shape of a part is convex orconcave depends on whether a collimated ray passing through that partconverges or diverges. That is, while applying a collimated ray to apart to be determined in terms of shape, the collimated ray passingthrough that part will be bended and the ray itself or its extensionline will eventually meet the optical axis. The shape of that part canbe determined by whether the ray or its extension line meets(intersects) the optical axis (focal point) at the object-side orimage-side. For instance, if the ray itself intersects the optical axisat the image side of the lens element after passing through a part, i.e.the focal point of this ray is at the image side (see point R in FIG.2), the part will be determined as having a convex shape. On thecontrary, if the ray diverges after passing through a part, theextension line of the ray intersects the optical axis at the object sideof the lens element, i.e. the focal point of the ray is at the objectside (see point M in FIG. 2), that part will be determined as having aconcave shape. Therefore, referring to FIG. 2, the part between thecentral point and the first transition point may have a convex shape,the part located radially outside of the first transition point may havea concave shape, and the first transition point is the point where thepart having a convex shape changes to the part having a concave shape,namely the border of two adjacent parts. Alternatively, there is anothermethod to determine whether a part in a vicinity of the optical axis mayhave a convex or concave shape by referring to the sign of an “R” value,which is the (paraxial) radius of curvature of a lens surface. The Rvalue may be used in conventional optical design software such as Zemaxand CodeV. The R value usually appears in the lens data sheet in thesoftware. For an object-side surface, positive R means that theobject-side surface is convex, and negative R means that the object-sidesurface is concave. Conversely, for an image-side surface, positive Rmeans that the image-side surface is concave, and negative R means thatthe image-side surface is convex. The result found by using this methodshould be consistent as by using the other way mentioned above, whichdetermines surface shapes by referring to whether the focal point of acollimated ray is at the object side or the image side.

For none transition point cases, the part in a vicinity of the opticalaxis may be defined as the part between 0-50% of the effective radius(radius of the clear aperture) of the surface, whereas the part in avicinity of a periphery of the lens element may be defined as the partbetween 50-100% of effective radius (radius of the clear aperture) ofthe surface.

Referring to the first example depicted in FIG. 3, only one transitionpoint, namely a first transition point, appears within the clearaperture of the image-side surface of the lens element. Part I may be apart in a vicinity of the optical axis, and part II may be a part in avicinity of a periphery of the lens element. The part in a vicinity ofthe optical axis may be determined as having a concave surface due tothe R value at the image-side surface of the lens element is positive.The shape of the part in a vicinity of a periphery of the lens elementmay be different from that of the radially inner adjacent part, i.e. theshape of the part in a vicinity of a periphery of the lens element maybe different from the shape of the part in a vicinity of the opticalaxis; the part in a vicinity of a periphery of the lens element may havea convex shape.

Referring to the second example depicted in FIG. 4, a first transitionpoint and a second transition point may exist on the object-side surface(within the clear aperture) of a lens element. In which part I may bethe part in a vicinity of the optical axis, and part III may be the partin a vicinity of a periphery of the lens element. The part in a vicinityof the optical axis may have a convex shape because the R value at theobject-side surface of the lens element may be positive. The part in avicinity of a periphery of the lens element (part III) may have a convexshape. What is more, there may be another part having a concave shapeexisting between the first and second transition point (part II).

Referring to a third example depicted in FIG. 5, no transition point mayexist on the object-side surface of the lens element. In this case, thepart between 0-50% of the effective radius (radius of the clearaperture) may be determined as the part in a vicinity of the opticalaxis, and the part between 50-100% of the effective radius may bedetermined as the part in a vicinity of a periphery of the lens element.The part in a vicinity of the optical axis of the object-side surface ofthe lens element may be determined as having a convex shape due to itspositive R value, and the part in a vicinity of a periphery of the lenselement may be determined as having a convex shape as well.

In the present disclosure, various examples of optical imaging lensesare provided, including examples in which the optical imaging lens is aprime lens. Example embodiments of optical imaging lenses may comprise,sequentially from an object side to an image side along an optical axis,a first, second, third, fourth, fifth and sixth lens elements and afilter unit, in which each of said lens elements has an object-sidesurface facing toward the object side and an image-side surface facingtoward the image side. The optical imaging lens of the presentdisclosure achieves good optical characteristics and provides ashortened length due to the design characteristics of each lens element.

The optical imaging lens may include variations of any of the abovementioned characteristics, and the system may vary one or more lenselements. In addition, the system may include variations of additionaloptical features as well as variations of the optical lens length of theoptical imaging lens. For example, the first lens element may havepositive refracting power, which is favorable to gather light; theobject-side surface of the second lens element may comprise a convexportion in a vicinity of a periphery of the second lens element and theobject-side surface of the third lens element may comprise a convexportion in a vicinity of a periphery of the third lens element, which isfavorable to gather edge image light; the object-side surface of thesixth lens element may comprise a concave portion in a vicinity of aperiphery of the sixth lens element and the image-side surface maycomprise a convex portion in a vicinity of a periphery of the sixth lenselement. The above mentioned designs may effectively eliminateaberrations, reduce the length of the optical lens, and enhance imagingquality and telephoto characteristics, to provide a more clear image ofa local portion of the object.

In addition, controlling the parameters of each lens element asdescribed herein may beneficially provide a designer with theflexibility to design an optical imaging lens with good opticalperformance, shortened length, enhanced telephoto characteristics, andtechnological feasibility.

For example, lengthening EFL may reduce the field of view for telephotocharacteristics. However, the optical imaging lens used in many cellphones today involves miniaturized dimensions that may affect thelengthening range of the EFL. In view of the above, satisfying any oneof the following equations may result in decreasing the thickness of thesystem. Furthermore, the field of view may be reduced and the telephotocharacteristics may be satisfied:

EFL/TTL≧1  Equation (1);

EFL/T4≧8.5  Equation (4); and

EFL/(G23+T3)≧5.5  Equation (20).

In some embodiments, the value of EFL/TTL may be further restrictedbetween 1.00 and 1.20. In some embodiments, the value of EFL/T4 may befurther restricted between 8.50 and 45.50. In some embodiments, thevalue of EFL/(G23+T3)≧5.5 may be further restricted between 5.50 and13.00. As a result of restricting various values as described above, theimaging quality of the optical imaging lens may be improved.

Properly decreasing the thicknesses of the lens elements as well as theair gaps between the lens elements serves to shorten the length of theoptical imaging lens and allow for the system to focus more easily,which raises image quality. In this manner, the thicknesses of the lenselements and the air gaps between the lens elements may be adjusted tosatisfy any one of equations described below, to result in arrangementsthat overcome the difficulties of providing improved imaging qualitywhile overcoming the previously described difficulties related toassembling the optical lens system:

TTL/Gmax≦7.65  Equation (2);

(G34+T5)/T6≦11.5  Equation (7);

(T3+G34)/T6≦11.5  Equation (8);

G34/T6≦7.5  Equation (9);

(T2+T5)/T6≦6  Equation (10);

(G12+T3)/T6≦6.5  Equation (12);

(G45+G56)/T6≦10  Equation (13);

(G34+T6)/T6≦8.5  Equation (14);

(T2+G45)/T6≦7.5  Equation (15);

ALT/(G12+T6)≦11  Equation (17);

Gaa/(T2+T6)≦5.5  Equation (18);

TTL/(T3+T6)≦6.5  Equation (19);

(T2+T3)/T6≦10.5  Equation (22); and

(G23+G45)/T6≦10  Equation (23).

When the design of the optical imaging lens could satisfy any one ofEquations (2), (7), (8), (9), (10), (12), (13), (14), (15), (17), (18),(19), (22) and (23), and the denominators of theses equations are fixed,the numerators could be reduced to reduce the volume of the opticalimaging lens.

In some embodiments, the value of TTL/Gmax may be further restrictedbetween 3.20 and 7.65. In some embodiments, the value of (G34+T5)/T6 maybe further restricted between 0.70 and 11.50. In some embodiments, thevalue of (T3+G34)/T6 may be further restricted between 1.00 and 11.50.In some embodiments, the value of G34/T6 may be further restrictedbetween 0.10 and 7.50. In some embodiments, the value of (T2+T5)/T6 maybe further restricted between 0.40 and 6.00. In some embodiments, thevalue of (G12+T3)/T6 may be further restricted between 0.60 and 6.50. Insome embodiments, the value of (G45+G56)/T6 may be further restrictedbetween 0.90 and 10.00. In some embodiments, the value of (G34+T6)/T6may be further restricted between 1.10 and 8.50. In some embodiments,the value of (T2+G45)/T6 may be further restricted between 0.90 and7.50. In some embodiments, the value of ALT/(G12+T6) may be furtherrestricted between 2.90 and 11.00. In some embodiments, the value ofGaa/(T2+T6) may be further restricted between 1.30 and 5.50. In someembodiments, the value of TTL/(T3+T6) may be further restricted between3.20 and 6.50. In some embodiments, the value of (T2+T3)/T6 may befurther restricted between 0.70 and 10.50. In some embodiments, thevalue of (G23+G45)/T6 may be further restricted between 0.90 and 10.00.

In addition, the parameters set forth in the present disclosure could bevaried to satisfy any one of equations below, such that the opticalimaging lens could be in proper arrangement and have good image quality:

BFL/(T2+G56)≧1.5  Equation (3);

BFL/(G23+G56)≧1.5  Equation (5);

TTL/T4≧9  Equation (6);

Gmax/G23≧2.5  Equation (11);

Gmax/(G12+G23)≧2.5  Equation (16);

(G12+T6)/T2≧2  Equation (21);

BFL/(G23+T4)≧1  Equation (24); and

(G23+T6)/G23≧2  Equation (25).

In some embodiments, the value of BFL/(T2+G56) may be further restrictedbetween 1.50 and 8.40. In some embodiments, the value of BFL/(G23+G56)may be further restricted between 1.50 and 7.00. In some embodiments,the value of TTL/T4 may be further restricted between 9.00 and 40.50. Insome embodiments, the value of Gmax/G23 may be further restrictedbetween 2.50 and 74.10. In some embodiments, the value of Gmax/(G12+G23)may be further restricted between 2.50 and 20.30. In some embodiments,the value of (G12+T6)/T2 may be further restricted between 2.00 and5.60. In some embodiments, the value of BFL/(G23+T4) may be furtherrestricted between 1.00 and 4.70. In some embodiments, the value of(G23+T6)/G23 may be further restricted between 2.00 and 16.70.

It should be appreciated that numerous variations are possible whenconsidering improvements to the design of an optical system. When theoptical imaging lens of the present disclosure satisfies at least one ofthe equations described above, the length of the optical lens may bereduced, the aperture stop may be enlarged (F-number may be reduced),the field angle may be reduced, the imaging quality may be enhanced, orthe assembly yield may be upgraded. Such characteristics mayadvantageously mitigate various drawbacks in other optical systemdesigns.

When implementing example embodiments, more details about the convex orconcave surface could be incorporated for one specific lens element orbroadly for plural lens elements to enhance the control for the systemperformance and/or resolution. It is noted that the details listed herecould be incorporated in example embodiments if no inconsistency occurs.

Several exemplary embodiments and associated optical data will now beprovided to illustrate non-limiting examples of optical imaging lenssystems having good optical characteristics and a shortened length.Reference is now made to FIGS. 6-9. FIG. 6 illustrates an examplecross-sectional view of an optical imaging lens 1 having six lenselements according to a first example embodiment. FIG. 7 shows examplecharts of longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 1 according to the first exampleembodiment. FIG. 8 illustrates an example table of optical data of eachlens element of the optical imaging lens 1 according to the firstexample embodiment. FIG. 9 depicts an example table of aspherical dataof the optical imaging lens 1 according to the first example embodiment.

As shown in FIG. 6, the optical imaging lens 1 of the present embodimentmay comprise, in order from an object side A1 to an image side A2 alongan optical axis, an aperture stop 100, a first lens element 110, asecond lens element 120, a third lens element 130, a fourth lens element140, a fifth lens element 150 and a sixth lens element 160. A filteringunit 170 and an image plane 180 of an image sensor (not shown) arepositioned at the image side A2 of the optical imaging lens 1. Each ofthe first, second, third, fourth, fifth and sixth lens elements 110,120, 130, 140, 150, 160 and the filtering unit 170 may comprise anobject-side surface 111/121/131/141/151/161/171 facing toward the objectside A1 and an image-side surface 112/122/132/142/152/162/172 facingtoward the image side A2. The example embodiment of the filtering unit170 illustrated is an IR cut filter (infrared cut filter) positionedbetween the sixth lens element 160 and an image plane 180. The filteringunit 170 selectively absorbs light passing optical imaging lens 1 thathas a specific wavelength. For example, if IR light is absorbed, IRlight which is not seen by human eyes is prohibited from producing animage on the image plane 180.

Exemplary embodiments of each lens element of the optical imaging lens 1will now be described with reference to the drawings. The lens elementsof the optical imaging lens 1 are constructed using plastic material, insome embodiments.

An example embodiment of the first lens element 110 may have positiverefracting power. The object-side surface 111 may comprise a convexportion 1111 in a vicinity of an optical axis and a convex portion 1112in a vicinity of a periphery of the first lens element 110. Theimage-side surface 112 may comprise a concave portion 1121 in a vicinityof the optical axis and a concave portion 1122 in a vicinity of aperiphery of the first lens element 110. The object-side surface 111 andthe image-side surface 112 may be aspherical surfaces.

An example embodiment of the second lens element 120 may have negativerefracting power. The object-side surface 121 may comprise a convexportion 1211 in a vicinity of the optical axis and a convex portion 1212in a vicinity of a periphery of the second lens element 120. Theimage-side surface 122 may comprise a concave portion 1221 in a vicinityof the optical axis and a concave portion 1222 in a vicinity of aperiphery of the second lens element 120. The object-side surface 121and the image-side surface 122 may be aspherical surfaces.

An example embodiment of the third lens element 130 may have positiverefracting power. The object-side surface 131 may comprise a convexportion 1311 in a vicinity of the optical axis and a convex portion 1312in a vicinity of a periphery of the third lens element 130. Theimage-side surface 132 may comprise a concave portion 1321 in a vicinityof the optical axis and a concave portion 1322 in a vicinity of aperiphery of the third lens element 130. The object-side surface 131 andthe image-side surface 132 may be aspherical surfaces.

An example embodiment of the fourth lens element 140 may have negativerefracting power. The object-side surface 141 may comprise a convexportion 1411 in a vicinity of the optical axis and a concave portion1412 in a vicinity of a periphery of the fourth lens element 140. Theimage-side surface 142 may comprise a concave portion 1421 in a vicinityof the optical axis and a concave portion 1422 in a vicinity of aperiphery of the fourth lens element 140. The object-side surface 141and the image-side surface 142 may be aspherical surfaces.

An example embodiment of the fifth lens element 150 may have negativerefracting power. The object-side surface 151 may comprise a convexportion 1511 in a vicinity of the optical axis and a concave portion1512 in a vicinity of a periphery of the fifth lens element 150. Theimage-side surface 152 may comprise a concave portion 1521 in a vicinityof the optical axis and a convex portion 1522 in a vicinity of aperiphery of the fifth lens element 150. The object-side surface 151 andthe image-side surface 152 may be aspherical surfaces.

An example embodiment of the sixth lens element 160 may have positiverefracting power. The object-side surface 161 may comprise a concaveportion 1611 in a vicinity of the optical axis and a concave portion1612 in a vicinity of a periphery of the sixth lens element 160. Theimage-side surface 162 may comprise a convex portion 1621 in a vicinityof the optical axis and a convex portion 1622 in a vicinity of aperiphery of the sixth lens element 160. The object-side surface 161 andthe image-side surface 162 may be aspherical surfaces.

In example embodiments, air gaps exist between the lens elements 110,120, 130, 140, 150, the filtering unit 170 and the image plane 180 ofthe image sensor. For example, FIG. 6 illustrates the air gap d1existing between the first lens element 110 and the second lens element120, the air gap d2 existing between the second lens element 120 and thethird lens element 130, the air gap d3 existing between the third lenselement 130 and the fourth lens element 140, the air gap d4 existingbetween the fourth lens element 140 and the fifth lens element 150, theair gap d5 existing between the fifth lens element 150 and the sixthlens element 160, the air gap d6 existing between the sixth lens element160 and the filtering unit 170, and the air gap d7 existing between thefiltering unit 170 and the image plane 180 of the image sensor. However,in other embodiments, any of the aforesaid air gaps may or may notexist. For example, the profiles of opposite surfaces of any twoadjacent lens elements may correspond to each other, and in suchsituation, the air gap may not exist. The air gap d1 is denoted by G12,the air gap d2 is denoted by G23, the air gap d3 is denoted by G34, theair gap d4 is denoted by G45, the air gap d5 is denoted by G56, the airgap d6 is denoted by G6F, the air gap d7 is denoted by GFP, and the sumof d1, d2, d3, d4 and d5 is denoted by Gaa.

FIG. 8 depicts the optical characteristics of each lens elements in theoptical imaging lens 1 of the present embodiment. The asphericalsurfaces including the object-side surface 111 of the first lens element110, the image-side surface 112 of the first lens element 110, theobject-side surface 121 and the image-side surface 122 of the secondlens element 120, the object-side surface 131 and the image-side surface132 of the third lens element 130, the object-side surface 141 and theimage-side surface 142 of the fourth lens element 140, the object-sidesurface 151 and the image-side surface 152 of the fifth lens element150, the object-side surface 161 and the image-side surface 162 of thesixth lens element 160 are all defined by the following asphericalformula (1):

$\begin{matrix}{{Z(Y)} = {{\frac{Y^{2}}{R}\text{/}\left( {1 + \sqrt{1 - {\left( {1 + K} \right)\frac{Y^{2}}{R^{2}}}}} \right)} + {\Sigma_{i = 1}^{n}a_{2i} \times Y^{2i}}}} & {{formula}\mspace{14mu} (1)}\end{matrix}$

wherein,

R represents the radius of curvature of the surface of the lens element;

Z represents the depth of the aspherical surface (the perpendiculardistance between the point of the aspherical surface at a distance Yfrom the optical axis and the tangent plane of the vertex on the opticalaxis of the aspherical surface);

Y represents the perpendicular distance between the point of theaspherical surface and the optical axis;

K represents a conic constant;

a_(2i) represents an aspherical coefficient of 2i^(th) level.

The values of each aspherical parameter are shown in FIG. 9.

FIG. 7 part a shows the longitudinal spherical aberration, wherein thehorizontal axis of FIG. 7 part a defines the focus, and the verticalaxis of FIG. 7 part a defines the field of view. FIG. 7 part b shows theastigmatism aberration in the sagittal direction, wherein the horizontalaxis of FIG. 7 part b defines the focus, and the vertical axis of FIG. 7part b defines the image height. FIG. 7 part c shows the astigmatismaberration in the tangential direction, wherein the horizontal axis ofFIG. 7 part c defines the focus, and the vertical axis of FIG. 7 part cdefines the image height. FIG. 7 part d shows the variation of thedistortion aberration, wherein the horizontal axis of FIG. 7 part ddefines the percentage, and the vertical axis of FIG. 7(d) defines theimage height. The three curves with different wavelengths (470 nm, 555nm, 650 nm) represent that off-axis light with respect to thesewavelengths may be focused around an image point. From the verticaldeviation of each curve shown in FIG. 7 part a, the offset of theoff-axis light relative to the image point may be within about ±0.045mm. Therefore, the first embodiment may improve the longitudinalspherical aberration with respect to different wavelengths. Referring toFIG. 7 part b, the focus variation with respect to the three differentwavelengths (470 nm, 555 nm, 650 nm) in the whole field may fall withinabout ±0.04 mm. Referring to FIG. 7 part c, the focus variation withrespect to the three different wavelengths (470 nm, 555 nm, 650 nm) inthe whole field may fall within about ±0.075 mm. Referring to FIG. 7part d, the horizontal axis of FIG. 7 part d, the variation of thedistortion aberration may be within about ±1.0%.

Please refer to FIG. 54A and FIG. 54B for the values of EFL, TL, BFL,TTL, Gmax, ALT, Gaa, EFL/TTL, TTL/Gmax, BFL/(T2+G56), EFL/T4,BFL/(G23+G56), TTL/T4, (G34+T5)/T6, (T3+G34)/T6, G34/T6, (T2+T5)/T6,Gmax/G23, (G12+T3)/T6, (G45+G56)/T6, (G34+T6)/T6, (T2+G45)/T6,Gmax/(G12+G23), ALT/(G12+T6), Gaa/(T2+T6), TTL/(T3+T6), EFL/(G23+T3),(G12+T6)/T2, (T2+T3)/T6, (G23+G45)/T6, BFL/(G23+T4) and (G23+T6)/G23 ofthe present embodiment.

The distance from the object-side surface 111 of the first lens element110 to the image plane 180 along the optical axis may be about 6.262 mm,EFL may be about 6.498 mm, the image height may be about 2.911 mm, HFOVmay be about 25 degrees, and Fno may be about 2.05. In accordance withthese values, the present embodiment may provide an optical imaging lenshaving a shortened length, and may be capable of accommodating a slimproduct profile that also renders improved optical performance.

Reference is now made to FIGS. 10-13. FIG. 10 illustrates an examplecross-sectional view of an optical imaging lens 2 having six lenselements according to a second example embodiment. FIG. 11 shows examplecharts of longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 2 according to the secondexample embodiment. FIG. 12 shows an example table of optical data ofeach lens element of the optical imaging lens 2 according to the secondexample embodiment. FIG. 13 shows an example table of aspherical data ofthe optical imaging lens 2 according to the second example embodiment.The reference numbers labeled in the present embodiment are similar tothose in the first embodiment for the similar elements, but here thereference numbers are initialed with 2, for example, reference number231 for labeling the object-side surface of the third lens element 230,reference number 232 for labeling the image-side surface of the thirdlens element 230, etc.

As shown in FIG. 10, the optical imaging lens 2 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop 200, a first lens element210, a second lens element 220, a third lens element 230, a fourth lenselement 240, a fifth lens element 250 and a sixth lens element 260.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces 211, 221, 231, 241, and 261 and the image-sidesurfaces 212, 222, 232, 242, 252, and 262 are generally similar to theoptical imaging lens 1. The differences between the optical imaging lens1 and the optical imaging lens 2 may include the concave/convex shape ofthe object-side surface 251 facing to the object side A1, a radius ofcurvature, a refracting power, a thickness, aspherical data, and aneffective focal length of each lens element. More specifically, theobject-side surface 251 may comprise a concave portion 2511 in avicinity of the optical axis.

Here, for clearly showing the drawings of the present embodiment, onlythe surface shapes which are different from that in the first embodimentare labeled. Please refer to FIG. 12 for the optical characteristics ofeach lens element in the optical imaging lens 2 of the presentembodiment.

From the vertical deviation of each curve shown in FIG. 11 part a, theoffset of the off-axis light relative to the image point may be withinabout ±0.045 mm. Referring to FIG. 11 part b, the focus variation withrespect to the three different wavelengths (470 nm, 555 nm, 650 nm) inthe whole field may fall within about ±0.04 mm. Referring to FIG. 11part c, the focus variation with respect to the three differentwavelengths (470 nm, 555 nm, 650 nm) in the whole field may fall withinabout ±0.08 mm. Referring to FIG. 11 part d, the variation of thedistortion aberration of the optical imaging lens 2 may be within about±0.8%.

Please refer to FIG. 54A and FIG. 54B for the values of EFL, TL, BFL,TTL, Gmax, ALT, Gaa, EFL/TTL, TTL/Gmax, BFL/(T2+G56), EFL/T4,BFL/(G23+G56), TTL/T4, (G34+T5)/T6, (T3+G34)/T6, G34/T6, (T2+T5)/T6,Gmax/G23, (G12+T3)/T6, (G45+G56)/T6, (G34+T6)/T6, (T2+G45)/T6,Gmax/(G12+G23), ALT/(G12+T6), Gaa/(T2+T6), TTL/(T3+T6), EFL/(G23+T3),(G12+T6)/T2, (T2+T3)/T6, (G23+G45)/T6, BFL/(G23+T4) and (G23+T6)/G23 ofthe present embodiment.

The distance from the object-side surface 211 of the first lens element210 to the image plane 280 along the optical axis may be about 6.269 mm,EFL may be about 6.498 mm, the image height may be about 2.911 mm, HFOVmay be about 25 degrees, and Fno may be about 2.05.

In comparison with the first embodiment, distortion aberration in thesecond embodiment may be smaller. Further, the second embodiment may bemanufactured more easily and the yield rate may be higher.

Reference is now made to FIGS. 14-17. FIG. 14 illustrates an examplecross-sectional view of an optical imaging lens 3 having six lenselements according to a third example embodiment. FIG. 15 shows examplecharts of longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 3 according to the third exampleembodiment. FIG. 16 shows an example table of optical data of each lenselement of the optical imaging lens 3 according to the third exampleembodiment. FIG. 17 shows an example table of aspherical data of theoptical imaging lens 3 according to the third example embodiment. Thereference numbers labeled in the present embodiment are similar to thosein the first embodiment for the similar elements, but here the referencenumbers are initialed with 3, for example, reference number 331 forlabeling the object-side surface of the third lens element 330,reference number 332 for labeling the image-side surface of the thirdlens element 330, etc.

As shown in FIG. 14, the optical imaging lens 3 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop 300, a first lens element310, a second lens element 320, a third lens element 330, a fourth lenselement 340, a fifth lens element 350 and a sixth lens element 360.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces 311, 331, and 361 and the image-side surfaces332, 342, and 352 are generally similar to the optical imaging lens 1.The differences between the optical imaging lens 1 and the opticalimaging lens 3 may include the concave/convex shapes of the image-sidesurfaces 312, 322, and 362, the concave/convex shapes of the object-sidesurfaces 321, 341, and 351, a radius of curvature, a thickness,aspherical data, and an effective focal length of each lens element.More specifically, the image-side surface 312 may comprise a convexportion 3121 in a vicinity of the optical axis, the object-side surface321 may comprise a concave portion 3211 in a vicinity of the opticalaxis, the image-side surface 322 may comprise a convex portion 3221 in avicinity of the optical axis, the object-side surface 341 may comprise aconcave portion 3411 in a vicinity of the optical axis, the object-sidesurface 351 may comprise a concave portion 3511 in a vicinity of theoptical axis, and the image-side surface 362 may comprises a concaveportion 3621 in a vicinity of the optical axis.

Here, for clearly showing the drawings of the present embodiment, onlythe surface shapes which are different from that in the first embodimentare labeled. Please refer to FIG. 16 for the optical characteristics ofeach lens element in the optical imaging lens 3 of the presentembodiment.

From the vertical deviation of each curve shown in FIG. 15 part a, theoffset of the off-axis light relative to the image point may be withinabout ±0.045 mm. Referring to FIG. 15 part b, the focus variation withrespect to the three different wavelengths (470 nm, 555 nm, 650 nm) inthe whole field may fall within about ±0.04 mm. Referring to FIG. 15part c, the focus variation with respect to the three differentwavelengths (470 nm, 555 nm, 650 nm) in the whole field may fall withinabout ±0.12 mm. Referring to FIG. 15 part d, the variation of thedistortion aberration of the optical imaging lens 3 may be within about±2.5%.

Please refer to FIG. 54A and FIG. 54B for the values of EFL, TL, BFL,TTL, Gmax, ALT, Gaa, EFL/TTL, TTL/Gmax, BFL/(T2+G56), EFL/T4,BFL/(G23+G56), TTL/T4, (G34+T5)/T6, (T3+G34)/T6, G34/T6, (T2+T5)/T6,Gmax/G23, (G12+T3)/T6, (G45+G56)/T6, (G34+T6)/T6, (T2+G45)/T6,Gmax/(G12+G23), ALT/(G12+T6), Gaa/(T2+T6), TTL/(T3+T6), EFL/(G23+T3),(G12+T6)/T2, (T2+T3)/T6, (G23+G45)/T6, BFL/(G23+T4) and (G23+T6)/G23 ofthe present embodiment.

The distance from the object-side surface 311 of the first lens element310 to the image plane 380 along the optical axis may be about 7.961 mm,EFL may be about 9.000 mm, the image height may be about 2.944 mm, HFOVmay be about 18.052 degrees, and Fno may be about 2.05.

In comparison with the first embodiment, EFL of the third embodiment maybe longer, HFOV of the third embodiment may be smaller, and thetelephoto effect of the third embodiment may be better. Furthermore, thethird embodiment of the optical imaging lens may be manufactured moreeasily and its yield rate may be higher.

Reference is now made to FIGS. 18-21. FIG. 18 illustrates an examplecross-sectional view of an optical imaging lens 4 having six lenselements according to a fourth example embodiment. FIG. 19 shows examplecharts of longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 4 according to the fourthembodiment. FIG. 20 shows an example table of optical data of each lenselement of the optical imaging lens 4 according to the fourth exampleembodiment. FIG. 21 shows an example table of aspherical data of theoptical imaging lens 4 according to the fourth example embodiment. Thereference numbers labeled in the present embodiment are similar to thosein the first embodiment for the similar elements, but here the referencenumbers are initialed with 4, for example, reference number 431 forlabeling the object-side surface of the third lens element 430,reference number 432 for labeling the image-side surface of the thirdlens element 430, etc.

As shown in FIG. 18, the optical imaging lens 4 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop 400, a first lens element410, a second lens element 420, a third lens element 430, a fourth lenselement 440, a fifth lens element 450 and a sixth lens element 460.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces 411, 431, 441, and 461 and the image-sidesurfaces 412, 422, 442, 452, and 462 are generally similar to theoptical imaging lens 1. The differences between the optical imaging lens1 and the optical imaging lens 4 may include the concave/convex shapesof the object-side surface 421, the concave/convex shapes of theimage-side surface 432, the concave/convex shapes of the object-sidesurface 451, a radius of curvature, a thickness, aspherical data, and aneffective focal length of each lens element. More specifically, theobject-side surface 421 may comprise a concave portion 4211 in avicinity of the optical axis, the image-side surface 432 may comprise aconvex portion 4322 in a vicinity of a periphery of the third lenselement 430, and the object-side surface 451 may comprise a concaveportion 4511 in a vicinity of the optical axis.

Here, for clearly showing the drawings of the present embodiment, onlythe surface shapes which are different from that in the first embodimentare labeled. Please refer to FIG. 20 for the optical characteristics ofeach lens elements in the optical imaging lens 4 of the presentembodiment.

From the vertical deviation of each curve shown in FIG. 19 part a, theoffset of the off-axis light relative to the image point may be withinabout ±0.06 mm. Referring to FIG. 19 part b, the focus variation withrespect to the three different wavelengths (470 nm, 555 nm, 650 nm) inthe whole field may fall within about ±0.04 mm. Referring to FIG. 19part c, the focus variation with respect to the three differentwavelengths (470 nm, 555 nm, 650 nm) in the whole field may fall withinabout ±0.12 mm. Referring to FIG. 19 part d, the variation of thedistortion aberration of the optical imaging lens 4 may be within about±1.2%.

Please refer to FIG. 54A and FIG. 54B for the values of EFL, TL, BFL,TTL, Gmax, ALT, Gaa, EFL/TTL, TTL/Gmax, BFL/(T2+G56), EFL/T4,BFL/(G23+G56), TTL/T4, (G34+T5)/T6, (T3+G34)/T6, G34/T6, (T2+T5)/T6,Gmax/G23, (G12+T3)/T6, (G45+G56)/T6, (G34+T6)/T6, (T2+G45)/T6,Gmax/(G12+G23), ALT/(G12+T6), Gaa/(T2+T6), TTL/(T3+T6), EFL/(G23+T3),(G12+T6)/T2, (T2+T3)/T6, (G23+G45)/T6, BFL/(G23+T4) and (G23+T6)/G23 ofthe present embodiment.

The distance from the object-side surface 411 of the first lens element410 to the image plane 480 along the optical axis may be about 5.908 mm,EFL may be about 6.141 mm, the image height may be about 2.619 mm, HFOVmay be about 22.896 degrees, and Fno may be about 2.29.

Comparing with the first embodiment, HFOV of the fourth embodiment maybe smaller, TTL of the fourth embodiment may be shorter, and thetelephoto effect of the fourth embodiment may be better, such that thelength of the optical imaging lens of the fourth embodiment may beshorter. Furthermore, the fourth embodiment of the optical imaging lensmay be manufactured more easily and its yield rate may be higher.

Reference is now made to FIGS. 22-25. FIG. 22 illustrates an examplecross-sectional view of an optical imaging lens 5 having six lenselements according to a fifth example embodiment. FIG. 23 shows examplecharts of longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 5 according to the fifthembodiment. FIG. 24 shows an example table of optical data of each lenselement of the optical imaging lens 5 according to the fifth exampleembodiment. FIG. 25 shows an example table of aspherical data of theoptical imaging lens 5 according to the fifth example embodiment. Thereference numbers labeled in the present embodiment are similar to thosein the first embodiment for the similar elements, but here the referencenumbers are initialed with 5, for example, reference number 531 forlabeling the object-side surface of the third lens element 530,reference number 532 for labeling the image-side surface of the thirdlens element 530, etc.

As shown in FIG. 22, the optical imaging lens 5 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop 500, a first lens element510, a second lens element 520, a third lens element 530, a fourth lenselement 540, a fifth lens element 550 and a sixth lens element 560.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces 511, 521, and 531 and the image-side surfaces512, 522, 532, and 542 are generally similar to the optical imaging lens1. The differences between the optical imaging lens 1 and the opticalimaging lens 5 may include the concave/convex shapes of the object-sidesurfaces 541 and 551, the concave/convex shapes of the image-sidesurfaces 552 and 562, the refracting power of the fifth lens element 550and the sixth lens element 560, the radius of curvature, the thickness,aspherical data, and the effective focal length of each lens element.More specifically, the object-side surface 541 may comprise a concaveportion 5411 in a vicinity of the optical axis, the object-side surface551 may comprise a concave portion 5511 in a vicinity of the opticalaxis, the image-side surface 552 may comprise a convex portion 5521 in avicinity of the optical axis, the image-side surface 562 may comprise aconcave portion 5621 in a vicinity of the optical axis, the fifth lenselement 550 may have positive refracting power, and the sixth lenselement 560 may have negative refracting power.

Here, for clearly showing the drawings of the present embodiment, onlythe surface shapes which are different from that in the first embodimentare labeled. FIG. 24 depicts the optical characteristics of each lenselements in the optical imaging lens 5 of the present embodiment.

From the vertical deviation of each curve shown in FIG. 23 part a, theoffset of the off-axis light relative to the image point may be withinabout ±0.06 mm. Referring to FIG. 23 part b, the focus variation withrespect to the three different wavelengths (470 nm, 555 nm, 650 nm) inthe whole field may fall within about ±0.03 mm. Referring to FIG. 23part c, the focus variation with respect to the three differentwavelengths (470 nm, 555 nm, 650 nm) in the whole field may fall withinabout ±0.03 mm. Referring to FIG. 23 part d, the variation of thedistortion aberration of the optical imaging lens 5 may be within about±3.0%.

Please refer to FIG. 54A and FIG. 54B for the values of EFL, TL, BFL,TTL, Gmax, ALT, Gaa, EFL/TTL, TTL/Gmax, BFL/(T2+G56), EFL/T4,BFL/(G23+G56), TTL/T4, (G34+T5)/T6, (T3+G34)/T6, G34/T6, (T2+T5)/T6,Gmax/G23, (G12+T3)/T6, (G45+G56)/T6, (G34+T6)/T6, (T2+G45)/T6,Gmax/(G12+G23), ALT/(G12+T6), Gaa/(T2+T6), TTL/(T3+T6), EFL/(G23+T3),(G12+T6)/T2, (T2+T3)/T6, (G23+G45)/T6, BFL/(G23+T4) and (G23+T6)/G23 ofthe present embodiment.

The distance from the object-side surface 511 of the first lens element510 to the image plane 580 along the optical axis may be about 7.966 mm,EFL may be about 8.996 mm, the image height may be about 2.944 mm, HFOVmay be about 17.728 degrees, and Fno may be about 2.05.

In comparison with the first embodiment, the astigmatism aberration inthe sagittal and tangential directions may be greater, HFOV of the fifthembodiment may be smaller, the EFL of the fifth embodiment may belonger, the image quality of the fifth embodiment may be better, and thetelephoto effect of the fifth embodiment may be better. Furthermore, thefifth embodiment of the optical imaging lens may be manufactured moreeasily and the yield rate may be higher.

Reference is now made to FIGS. 26-29. FIG. 26 illustrates an examplecross-sectional view of an optical imaging lens 6 having six lenselements according to a sixth example embodiment. FIG. 27 shows examplecharts of longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 6 according to the sixthembodiment. FIG. 28 shows an example table of optical data of each lenselement of the optical imaging lens 6 according to the sixth exampleembodiment. FIG. 29 shows an example table of aspherical data of theoptical imaging lens 6 according to the sixth example embodiment. Thereference numbers labeled in the present embodiment are similar to thosein the first embodiment for the similar elements, but here the referencenumbers are initialed with 6, for example, reference number 631 forlabeling the object-side surface of the third lens element 630,reference number 632 for labeling the image-side surface of the thirdlens element 630, etc.

As shown in FIG. 26, the optical imaging lens 6 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop 600, a first lens element610, a second lens element 620, a third lens element 630, a fourth lenselement 640, a fifth lens element 650 and a sixth lens element 660.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces 611, 621, and 631 and the image-side surfaces612, 622, 632, and 652 are generally similar to the optical imaging lens1. The differences between the optical imaging lens 1 and the opticalimaging lens 6 may include the concave/convex shapes of the object-sidesurfaces 641, 651, and 661, and the concave/convex shapes of theimage-side surface 642 and 662, a radius of curvature, a thickness,aspherical data, and an effective focal length of each lens element.More specifically, the object-side surface 641 may comprise a concaveportion 6411 in a vicinity of the optical axis, the image-side surface642 may comprise a convex portion 6421 in a vicinity of the opticalaxis, the object-side surface 651 may comprise a concave portion 6511 ina vicinity of the optical axis, the object-side surface 661 may comprisea convex portion 6611 in a vicinity of the optical axis, and theimage-side surface 662 may comprises a concave portion 6621 in avicinity of the optical axis.

Here, for clearly showing the drawings of the present embodiment, onlythe surface shapes which are different from that in the first embodimentare labeled. Please refer to FIG. 28 for the optical characteristics ofeach lens elements in the optical imaging lens 6 of the presentembodiment.

From the vertical deviation of each curve shown in FIG. 27 part a, theoffset of the off-axis light relative to the image point may be withinabout ±0.045 mm. Referring to FIG. 27 part b, the focus variation withrespect to the three different wavelengths (470 nm, 555 nm, 650 nm) inthe whole field may fall within about ±0.04 mm. Referring to FIG. 23part c, the focus variation with respect to the three differentwavelengths (470 nm, 555 nm, 650 nm) in the whole field may fall withinabout ±0.075 mm. Referring to FIG. 27 part d, the variation of thedistortion aberration of the optical imaging lens 6 may be within about±2.0%.

Please refer to FIG. 54A and FIG. 54B for the values of EFL, TL, BFL,TTL, Gmax, ALT, Gaa, EFL/TTL, TTL/Gmax, BFL/(T2+G56), EFL/T4,BFL/(G23+G56), TTL/T4, (G34+T5)/T6, (T3+G34)/T6, G34/T6, (T2+T5)/T6,Gmax/G23, (G12+T3)/T6, (G45+G56)/T6, (G34+T6)/T6, (T2+G45)/T6,Gmax/(G12+G23), ALT/(G12+T6), Gaa/(T2+T6), TTL/(T3+T6), EFL/(G23+T3),(G12+T6)/T2, (T2+T3)/T6, (G23+G45)/T6, BFL/(G23+T4) and (G23+T6)/G23 ofthe present embodiment.

The distance from the object-side surface 611 of the first lens element610 to the image plane 680 along the optical axis may be about 7.957 mm,EFL may be about 9.000 mm, the image height may be about 2.944 mm, HFOVmay be about 17.868 degrees, and Fno may be about 2.05.

In comparison with the first embodiment, EFL of the sixth embodiment maybe longer, the HFOV of the sixth embodiment may be smaller, and thetelephoto effect of the sixth embodiment may be better. Furthermore, thesixth embodiment of the optical imaging lens may be manufactured moreeasily and the yield rate may be higher.

Reference is now made to FIGS. 30-33. FIG. 30 illustrates an examplecross-sectional view of an optical imaging lens 7 having six lenselements according to a seventh example embodiment. FIG. 31 showsexample charts of longitudinal spherical aberration and other kinds ofoptical aberrations of the optical imaging lens 7 according to theseventh embodiment. FIG. 32 shows an example table of optical data ofeach lens element of the optical imaging lens 7 according to the seventhexample embodiment. FIG. 33 shows an example table of aspherical data ofthe optical imaging lens 7 according to the seventh example embodiment.The reference numbers labeled in the present embodiment are similar tothose in the first embodiment for the similar elements, but here thereference numbers are initialed with 7, for example, reference number731 for labeling the object-side surface of the third lens element 730,reference number 732 for labeling the image-side surface of the thirdlens element 730, etc.

As shown in FIG. 30, the optical imaging lens 7 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop 700, a first lens element710, a second lens element 720, a third lens element 730, a fourth lenselement 740, a fifth lens element 750 and a sixth lens element 760.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces 711, 731, and 741 and the image-side surfaces722, 732, and 752 are generally similar to the optical imaging lens 1.The differences between the optical imaging lens 1 and the opticalimaging lens 7 may include the concave/convex shapes of the object-sidesurfaces 721, 751, and 761 and the concave/convex shapes of theimage-side surfaces 712, 732, 742, and 762, a radius of curvature, athickness, aspherical data, and an effective focal length of each lenselement. More specifically, the image-side surface 712 may comprise aconvex portion 7121 in a vicinity of the optical axis, the object-sidesurface 721 may comprise a concave portion 7211 in a vicinity of theoptical axis, image-side surface 732 may comprise a convex portion 7322in a vicinity of a periphery of the third lens element 730, theimage-side surface 742 may comprise a convex portion 7422 in a vicinityof a periphery of the fourth lens element 740, the object-side surface751 may comprise a concave portion 7511 in a vicinity of the opticalaxis, the object-side surface 761 may comprise a convex portion 7611 ina vicinity of the optical axis and the image-side surface 762 maycomprises a concave portion 7621 in a vicinity of the optical axis.

Here, for clearly showing the drawings of the present embodiment, onlythe surface shapes which are different from that in the first embodimentare labeled. Please refer to FIG. 32 for the optical characteristics ofeach lens elements in the optical imaging lens 7 of the presentembodiment.

From the vertical deviation of each curve shown in FIG. 31 part a, theoffset of the off-axis light relative to the image point may be within±0.013 mm. Referring to FIG. 31 part b, the focus variation with respectto the three different wavelengths (470 nm, 555 nm, 650 nm) in the wholefield falls within ±0.012 mm. Referring to FIG. 31 part c, the focusvariation with respect to the three different wavelengths (470 nm, 555nm, 650 nm) in the whole field falls within ±0.02 mm. Referring to FIG.31 part d, the variation of the distortion aberration of the opticalimaging lens 7 may be within ±0.65%.

Please refer to FIG. 54A and FIG. 54B for the values of EFL, TL, BFL,TTL, Gmax, ALT, Gaa, EFL/TTL, TTL/Gmax, BFL/(T2+G56), EFL/T4,BFL/(G23+G56), TTL/T4, (G34+T5)/T6, (T3+G34)/T6, G34/T6, (T2+T5)/T6,Gmax/G23, (G12+T3)/T6, (G45+G56)/T6, (G34+T6)/T6, (T2+G45)/T6,Gmax/(G12+G23), ALT/(G12+T6), Gaa/(T2+T6), TTL/(T3+T6), EFL/(G23+T3),(G12+T6)/T2, (T2+T3)/T6, (G23+G45)/T6, BFL/(G23+T4) and (G23+T6)/G23 ofthe present embodiment.

The distance from the object-side surface 711 of the first lens element710 to the image plane 780 along the optical axis may be about 6.335 mm,EFL may be about 6.336 mm, the image height may be about 2.619 mm, HFOVmay be about 22.327 degrees, and Fno may be about 2.36.

In comparison with the first embodiment, the longitudinal sphericalaberration of the seventh embodiment may be greater, the astigmaticaberration in the sagittal and tangential directions of the seventhembodiment may be greater, the variation of the distortion aberration ofthe seventh embodiment may be greater, HFOV of the fifth embodiment maybe smaller, and the telephoto effect of the seventh embodiment may bebetter. Furthermore, the seventh embodiment of the optical imaging lensmay be manufactured more easily and the yield rate may be higher.

Reference is now made to FIGS. 34-37. FIG. 34 illustrates an examplecross-sectional view of an optical imaging lens 8 having six lenselements according to an eighth example embodiment. FIG. 35 showsexample charts of longitudinal spherical aberration and other kinds ofoptical aberrations of the optical imaging lens 8 according to theeighth embodiment. FIG. 36 shows an example table of optical data ofeach lens element of the optical imaging lens 8 according to the eighthexample embodiment. FIG. 37 shows an example table of aspherical data ofthe optical imaging lens 8 according to the eighth example embodiment.The reference numbers labeled in the present embodiment are similar tothose in the first embodiment for the similar elements, but here thereference numbers are initialed with 8, for example, reference number831 for labeling the object-side surface of the third lens element 830,reference number 832 for labeling the image-side surface of the thirdlens element 830, etc.

As shown in FIG. 34, the optical imaging lens 8 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop 800, a first lens element810, a second lens element 820, a third lens element 830, a fourth lenselement 840, a fifth lens element 850 and a sixth lens element 860.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces 811, 821, 831, and 861 and the image-sidesurfaces 812, 822, and 832 are generally similar to the optical imaginglens 1. The differences between the optical imaging lens 1 and theoptical imaging lens 8 may include the concave/convex shapes of theobject-side surfaces 841, and 851, the concave/convex shapes of theimage-side surfaces 842, 852, and 862, the refracting power, a radius ofcurvature, a thickness, aspherical data, and an effective focal lengthof each lens element. More specifically, the object-side surface 841 maycomprise a concave portion 8411 in a vicinity of the optical axis, theimage-side surface 842 may comprise a convex portion 8422 in a vicinityof a periphery of the fourth lens element 840, the object-side surface851 may comprise a concave portion 8511 in a vicinity of the opticalaxis, the image-side surface 852 may comprise a convex portion 8521 in avicinity of the optical axis, the image-side surface 862 may comprise aconcave portion 8621 in a vicinity of the optical axis, the fifth lenselement 850 may have positive refracting power, and the sixth lenselement 860 may have negative refracting power.

Here, for clearly showing the drawings of the present embodiment, onlythe surface shapes which are different from that in the first embodimentare labeled. Please refer to FIG. 36 for the optical characteristics ofeach lens elements in the optical imaging lens 8 of the presentembodiment.

From the vertical deviation of each curve shown in FIG. 35 part a, theoffset of the off-axis light relative to the image point may be within±0.025 mm. Referring to FIG. 35 part b, the focus variation with respectto the three different wavelengths (470 nm, 555 nm, 650 nm) in the wholefield falls within ±0.035 mm. Referring to FIG. 35 part c, the focusvariation with respect to the three different wavelengths (470 nm, 555nm, 650 nm) in the whole field falls within ±0.045 mm. Referring to FIG.35 part d, the variation of the distortion aberration of the opticalimaging lens 8 may be within ±2.5%.

Please refer to FIG. 54A and FIG. 54B for the values of EFL, TL, BFL,TTL, Gmax, ALT, Gaa, EFL/TTL, TTL/Gmax, BFL/(T2+G56), EFL/T4,BFL/(G23+G56), TTL/T4, (G34+T5)/T6, (T3+G34)/T6, G34/T6, (T2+T5)/T6,Gmax/G23, (G12+T3)/T6, (G45+G56)/T6, (G34+T6)/T6, (T2+G45)/T6,Gmax/(G12+G23), ALT/(G12+T6), Gaa/(T2+T6), TTL/(T3+T6), EFL/(G23+T3),(G12+T6)/T2, (T2+T3)/T6, (G23+G45)/T6, BFL/(G23+T4) and (G23+T6)/G23 ofthe present embodiment.

The distance from the object-side surface 811 of the first lens element810 to the image plane 880 along the optical axis may be about 8.452 mm,EFL may be about 9.000 mm, the image height may be about 2.944 mm, HFOVmay be about 17.864 degrees, and Fno may be about 2.05.

In comparison with the first embodiment, the longitudinal sphericalaberration of the eighth embodiment may be smaller, the astigmatismaberration in the sagittal and tangential directions of the eighthembodiment may be greater, HFOV of the eighth embodiment may be smaller,EFL of the eighth embodiment may be longer, and the telephoto effect ofthe eighth embodiment may be better. Further, the eighth embodiment ofthe optical imaging lens may be manufactured more easily and the yieldrate may be higher.

Reference is now made to FIGS. 38-41. FIG. 38 illustrates an examplecross-sectional view of an optical imaging lens 9 having six lenselements according to a ninth example embodiment. FIG. 39 shows examplecharts of longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 9 according to the ninthembodiment. FIG. 40 shows an example table of optical data of each lenselement of the optical imaging lens 9 according to the ninth exampleembodiment. FIG. 41 shows an example table of aspherical data of theoptical imaging lens 9 according to the ninth example embodiment. Thereference numbers labeled in the present embodiment are similar to thosein the first embodiment for the similar elements, but here the referencenumbers are initialed with 9, for example, reference number 931 forlabeling the object-side surface of the third lens element 930,reference number 932 for labeling the image-side surface of the thirdlens element 930, etc.

As shown in FIG. 38, the optical imaging lens 9 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop 900, a first lens element910, a second lens element 920, a third lens element 930, a fourth lenselement 940, a fifth lens element 950 and a sixth lens element 960.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces 911, 921, 931, 961 and the image-side surfaces912, 922, 932 are generally similar to the optical imaging lens 1. Thedifferences between the optical imaging lens 1 and the optical imaginglens 9 may include the concave/convex shapes of the object-side surfaces941 and 951, the concave/convex shapes of the image-side surfaces 942,952, and 962, the refracting power, a radius of curvature, a thickness,aspherical data, and an effective focal length of each lens element.More specifically, the fifth lens element 950 may have positiverefracting power, the sixth lens element 960 may have negativerefracting power, the object-side surface 941 may comprise a concaveportion 9411 in a vicinity of the optical axis, the image-side surface942 may comprise a convex portion 9421 in a vicinity of the optical axisand a convex portion 9422 in a vicinity of a periphery of the fourthlens element 940, the object-side surface 951 may comprise a concaveportion 9511 in a vicinity of the optical axis, the image-side surface952 may comprise a convex portion 9521 in a vicinity of the opticalaxis, the image-side surface 962 may comprise a concave portion 9621 ina vicinity of the optical axis.

Here, for clearly showing the drawings of the present embodiment, onlythe surface shapes which are different from that in the first embodimentare labeled. Please refer to FIG. 40 for the optical characteristics ofeach lens elements in the optical imaging lens 9 of the presentembodiment.

From the vertical deviation of each curve shown in FIG. 39 part a, theoffset of the off-axis light relative to the image point may be within±0.04 mm. Referring to FIG. 39 part b, the focus variation with respectto the three different wavelengths (470 nm, 555 nm, 650 nm) in the wholefield falls within ±0.04 mm. Referring to FIG. 39 part c, the focusvariation with respect to the three different wavelengths (470 nm, 555nm, 650 nm) in the whole field falls within ±0.06 mm. Referring to FIG.39 part d, the variation of the distortion aberration of the opticalimaging lens 9 may be within ±3.0%.

Please refer to FIG. 54A and FIG. 54B for the values of EFL, TL, BFL,TTL, Gmax, ALT, Gaa, EFL/TTL, TTL/Gmax, BFL/(T2+G56), EFL/T4,BFL/(G23+G56), TTL/T4, (G34+T5)/T6, (T3+G34)/T6, G34/T6, (T2+T5)/T6,Gmax/G23, (G12+T3)/T6, (G45+G56)/T6, (G34+T6)/T6, (T2+G45)/T6,Gmax/(G12+G23), ALT/(G12+T6), Gaa/(T2+T6), TTL/(T3+T6), EFL/(G23+T3),(G12+T6)/T2, (T2+T3)/T6, (G23+G45)/T6, BFL/(G23+T4) and (G23+T6)/G23 ofthe present embodiment.

The distance from the object-side surface 911 of the first lens element910 to the image plane 980 along the optical axis may be about 7.995 mm,EFL may be about 8.999 mm, the image height may be about 2.944 mm, HFOVmay be about 17.809 degrees, and Fno may be about 2.05.

In comparison with the first embodiment, the longitudinal sphericalaberration, the astigmatism aberration in the tangential direction, andthe HFOV of the ninth embodiment may be smaller. Also, the EFL of theninth embodiment may be longer, and the telephoto effect of the ninthembodiment may be better. Further, the ninth embodiment of the opticalimaging lens may be manufactured more easily and the yield rate may behigher.

Reference is now made to FIGS. 42-45. FIG. 42 illustrates an examplecross-sectional view of an optical imaging lens 10 having six lenselements according to a tenth example embodiment. FIG. 43 shows examplecharts of longitudinal spherical aberration and other kinds of opticalaberrations of the optical imaging lens 10 according to the tenthembodiment. FIG. 44 shows an example table of optical data of each lenselement of the optical imaging lens 10 according to the tenth exampleembodiment. FIG. 45 shows an example table of aspherical data of theoptical imaging lens 10 according to the tenth example embodiment. Thereference numbers labeled in the present embodiment are similar to thosein the first embodiment for the similar elements, but here the referencenumbers are initialed with 10, for example, reference number 1031 forlabeling the object-side surface of the third lens element 930,reference number 1032 for labeling the image-side surface of the thirdlens element 1030, etc.

As shown in FIG. 42, the optical imaging lens 10 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop 1000, a first lenselement 1010, a second lens element 1020, a third lens element 1030, afourth lens element 1040, a fifth lens element 1050 and a sixth lenselement 1060.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces 1011, 1021, 1031, 1041, and 1061 and theimage-side surfaces 1012, 1022, 1042, and 1062 are generally similar tothe optical imaging lens 1. The differences between the optical imaginglens 1 and the optical imaging lens 10 may include the concave/convexshapes of the object-side surface 1051, the concave/convex shapes of theimage-side surfaces 1032 and 1052, the refracting power, a radius ofcurvature, a thickness, aspherical data, and an effective focal lengthof each lens element. More specifically, the fourth lens element 1040may have positive refracting power, the fifth lens element 1050 may havepositive refracting power, the sixth lens element 1060 may have negativerefracting power, the image-side surface 1032 may comprise a convexportion 10322 in a vicinity of a periphery of the third lens element1030, the object-side surface 1051 may comprises a concave portion 10511in a vicinity of the optical axis, and the image-side surface 1052 maycomprise a convex portion 10521 in a vicinity of the optical axis.

Here, for clearly showing the drawings of the present embodiment, onlythe surface shapes which are different from that in the first embodimentare labeled. Please refer to FIG. 44 for the optical characteristics ofeach lens elements in the optical imaging lens 10 of the presentembodiment.

From the vertical deviation of each curve shown in FIG. 43 part a, theoffset of the off-axis light relative to the image point may be within±0.035 mm. Referring to FIG. 43 part b, the focus variation with respectto the three different wavelengths (470 nm, 555 nm, 650 nm) in the wholefield falls within ±0.02 mm. Referring to FIG. 43 part c, the focusvariation with respect to the three different wavelengths (470 nm, 555nm, 650 nm) in the whole field falls within ±0.1 mm. Referring to FIG.43 part d, the variation of the distortion aberration of the opticalimaging lens 9 may be within ±0.4%.

Please refer to FIG. 54A and FIG. 54B for the values of EFL, TL, BFL,TTL, Gmax, ALT, Gaa, EFL/TTL, TTL/Gmax, BFL/(T2+G56), EFL/T4,BFL/(G23+G56), TTL/T4, (G34+T5)/T6, (T3+G34)/T6, G34/T6, (T2+T5)/T6,Gmax/G23, (G12+T3)/T6, (G45+G56)/T6, (G34+T6)/T6, (T2+G45)/T6,Gmax/(G12+G23), ALT/(G12+T6), Gaa/(T2+T6), TTL/(T3+T6), EFL/(G23+T3),(G12+T6)/T2, (T2+T3)/T6, (G23+G45)/T6, BFL/(G23+T4) and (G23+T6)/G23 ofthe present embodiment.

The distance from the object-side surface 1011 of the first lens element1010 to the image plane 1080 along the optical axis may be about 8.837mm, EFL may be about 9.000 mm, the image height may be about 2.944 mm,HFOV may be about 18.056 degrees, and Fno may be about 2.05.

In comparison with the first embodiment, the longitudinal sphericalaberration of the tenth embodiment may be greater, the astigmatismaberration in the sagittal direction of the tenth embodiment may besmaller, the variation of the distortion aberration of the tenthembodiment may be smaller, HFOV of the tenth embodiment may be smaller,the EFL of the tenth embodiment may be longer, and the telephoto effectof the tenth embodiment may be better. Further, the tenth embodiment ofthe optical imaging lens may be manufactured more easily and the yieldrate may be higher.

Reference is now made to FIGS. 46-49. FIG. 46 illustrates an examplecross-sectional view of an optical imaging lens 11 having six lenselements of the optical imaging lens according to a eleventh exampleembodiment. FIG. 47 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 11 according to the eleventh example embodiment. FIG. 48 shows anexample table of optical data of each lens element of the opticalimaging lens 11 according to the eleventh example embodiment. FIG. 49shows an example table of aspherical data of the optical imaging lens 11according to the eleventh example embodiment. The reference numberslabeled in the present embodiment are similar to those in the firstembodiment for the similar elements, but here the reference numbers areinitialed with 11, for example, reference number 1131 for labeling theobject-side surface of the third lens element 1130, reference number1132 for labeling the image-side surface of the third lens element 1130,etc.

As shown in FIG. 46, the optical imaging lens 11 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop 1100, a first lenselement 1110, a second lens element 1120, a third lens element 1130, afourth lens element 1140, a fifth lens element 1150 and a sixth lenselement 1160.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces 1111′, 1121′, 1131, 1141, and 1161 and theimage-side surfaces 1112′, 1122′, and 1142 are generally the same withthe optical imaging lens 1. The differences between the optical imaginglens 1 and the optical imaging lens 11 may include the concave/convexshapes of the object-side surface 1151, the concave/convex shapes of theimage-side surfaces 1132, 1152, and 1162, the refracting power, a radiusof curvature, a thickness, aspherical data, and an effective focallength of each lens element. More specifically, the fifth lens element1150 may have positive refracting power, the sixth lens element 1160 mayhave negative refracting power, the image-side surface 1132 may comprisea convex portion 11322 in a vicinity of a periphery of the third lenselement 1130, the object-side surface 1151 may comprise a concaveportion 11511 in a vicinity of the optical axis, the image-side surface1152 may comprise a convex portion 11521 in a vicinity of the opticalaxis, and the image-side surface 1162 may comprise a concave portion11621 in a vicinity of the optical axis.

Here, for clearly showing the drawings of the present embodiment, onlythe surface shapes which are different from that in the tenth embodimentare labeled. Please refer to FIG. 48 for the optical characteristics ofeach lens elements in the optical imaging lens 11 of the presentembodiment.

From the vertical deviation of each curve shown in FIG. 47 part a, theoffset of the off-axis light relative to the image point may be withinabout ±0.06 mm. Referring to FIG. 47 part b, the focus variation withrespect to the three different wavelengths (470 nm, 555 nm, 650 nm) inthe whole field may fall within about ±0.05 mm. Referring to FIG. 47part c, the focus variation with respect to the three differentwavelengths (470 nm, 555 nm, 650 nm) in the whole field may fall withinabout ±0.06 mm. Refer to FIG. 47 part d, the variation of the distortionaberration of the optical imaging lens 11 may be within about ±1.6%.

Please refer to FIG. 54A and FIG. 54B for the values of EFL, TL, BFL,TTL, Gmax, ALT, Gaa, EFL/TTL, TTL/Gmax, BFL/(T2+G56), EFL/T4,BFL/(G23+G56), TTL/T4, (G34+T5)/T6, (T3+G34)/T6, G34/T6, (T2+T5)/T6,Gmax/G23, (G12+T3)/T6, (G45+G56)/T6, (G34+T6)/T6, (T2+G45)/T6,Gmax/(G12+G23), ALT/(G12+T6), Gaa/(T2+T6), TTL/(T3+T6), EFL/(G23+T3),(G12+T6)/T2, (T2+T3)/T6, (G23+G45)/T6, BFL/(G23+T4) and (G23+T6)/G23 ofthe present embodiment.

The distance from the object-side surface 1111′ of the first lenselement 1110 to the image plane 1180 along the optical axis may be about8.745 mm, EFL may be about 9.001 mm, the image height may be about 2.944mm, HFOV may be about 17.856 degrees, and Fno may be about 2.05.

Comparing with the first embodiment, the astigmatism aberration in thetangential direction and HFOV of the eleventh embodiment may be smaller,EFL of the eleventh embodiment may be longer, and the telephoto effectof the eleventh embodiment may be better. Further, the eleventhembodiment may be manufactured more easily and the yield rate may behigher.

Reference is now made to FIGS. 50-53. FIG. 50 illustrates an examplecross-sectional view of an optical imaging lens 12 having six lenselements of the optical imaging lens according to a twelfth exampleembodiment. FIG. 51 shows example charts of longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 12 according to the twelfth example embodiment. FIG. 52 shows anexample table of optical data of each lens element of the opticalimaging lens 12 according to the twelfth example embodiment. FIG. 53shows an example table of aspherical data of the optical imaging lens 12according to the twelfth example embodiment. The reference numberslabeled in the present embodiment are similar to those in the tenthembodiment for the similar elements, but here the reference numbers areinitialed with 12, for example, reference number 1231 for labeling theobject-side surface of the third lens element 1230, reference number1232 for labeling the image-side surface of the third lens element 1230,etc.

As shown in FIG. 50, the optical imaging lens 12 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop 1200, a first lenselement 1210, a second lens element 1220, a third lens element 1230, afourth lens element 1240, a fifth lens element 1250 and a sixth lenselement 1260.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces 1211′, 1221′, 1231, and 1261 and the image-sidesurfaces 1212′, 1222′, and 1242 are generally same with the opticalimaging lens 1. The differences between the optical imaging lens 1 andthe optical imaging lens 12 may include the concave/convex shapes of theobject-side surfaces 1241, and 1251 and the concave/convex shapes of theimage-side surfaces 1232, 1252, and 1262, the refracting power, a radiusof curvature, a thickness, aspherical data, and an effective focallength of each lens element. More specifically, the fifth lens element1250 may have positive refracting power, the sixth lens element 1260 mayhave negative refracting power, the image-side surface 1232 may comprisea convex portion 12322 in a vicinity of a periphery of the third lenselement 1230, the object-side surface 1241 may comprise a concaveportion 12411 in a vicinity of the optical axis, the object-side surface1251 may comprise a concave portion 12511 in a vicinity of the opticalaxis, the image-side surface 1252 may comprise a convex portion 12521 ina vicinity of the optical axis, and the image-side surface 1262 maycomprise a concave portion 12621 in a vicinity of the optical axis.

Here, for clearly showing the drawings of the present embodiment, onlythe surface shapes which are different from that in the tenth embodimentare labeled. Please refer to FIG. 52 for the optical characteristics ofeach lens elements in the optical imaging lens 12 of the presentembodiment.

From the vertical deviation of each curve shown in FIG. 51 part a, theoffset of the off-axis light relative to the image point may be withinabout ±0.03 mm. Referring to FIG. 51 part b, the focus variation withrespect to the three different wavelengths (470 nm, 555 nm, 650 nm) inthe whole field may fall within about ±0.05 mm. Referring to FIG. 51part c, the focus variation with respect to the three differentwavelengths (470 nm, 555 nm, 650 nm) in the whole field may fall withinabout ±0.07 mm. Referring to FIG. 51 part d, the variation of thedistortion aberration of the optical imaging lens 12 may be within about±1.8%.

Please refer to FIG. 54A and FIG. 54B for the values of EFL, TL, BFL,TTL, Gmax, ALT, Gaa, EFL/TTL, TTL/Gmax, BFL/(T2+G56), EFL/T4,BFL/(G23+G56), TTL/T4, (G34+T5)/T6, (T3+G34)/T6, G34/T6, (T2+T5)/T6,Gmax/G23, (G12+T3)/T6, (G45+G56)/T6, (G34+T6)/T6, (T2+G45)/T6,Gmax/(G12+G23), ALT/(G12+T6), Gaa/(T2+T6), TTL/(T3+T6), EFL/(G23+T3),(G12+T6)/T2, (T2+T3)/T6, (G23+G45)/T6, BFL/(G23+T4) and (G23+T6)/G23 ofthe present embodiment.

The distance from the object-side surface 1211′ of the first lenselement 1210 to the image plane 1280 along the optical axis may be about8.478 mm, EFL may be about 9.002 mm, the image height may be about 2.944mm, HFOV may be about 17.830 degrees, and Fno may be about 2.05.

In comparison with the first embodiment, the longitudinal sphericalaberration in the twelfth embodiment may be smaller, the astigmatismaberration in the tangential direction in the twelfth embodiment may besmaller, HFOV of the twelfth embodiment may be smaller, EFL of thetwelfth embodiment may be longer, and the telephoto effect of thetwelfth embodiment may be better. Further, the twelfth embodiment may bemanufactured more easily and the yield rate may be higher.

Please refer to FIG. 54A and FIG. 54B which show the values of EFL, TL,BFL, TTL, Gmax, ALT, Gaa, EFL/TTL, TTL/Gmax, BFL/(T2+G56), EFL/T4,BFL/(G23+G56), TTL/T4, (G34+T5)/T6, (T3+G34)/T6, G34/T6, (T2+T5)/T6,Gmax/G23, (G12+T3)/T6, (G45+G56)/T6, (G34+T6)/T6, (T2+G45)/T6,Gmax/(G12+G23), ALT/(G12+T6), Gaa/(T2+T6), TTL/(T3+T6), EFL/(G23+T3),(G12+T6)/T2, (T2+T3)/T6, (G23+G45)/T6, BFL/(G23+T4) and (G23+T6)/G23 ofthe first to twelfth embodiments, and it is clear that the opticalimaging lenses of the first to twelfth embodiments may satisfy theEquations (1)-(25).

According to above disclosure, the longitudinal spherical aberration,the astigmatism aberration and the variation of the distortionaberration of each embodiment meet the use requirements of variouselectronic products which implement an optical imaging lens. Moreover,the off-axis light with respect to 470 nm, 555 nm and 650 nm wavelengthsmay be focused around an image point, and the offset of the off-axislight for each curve relative to the image point may be controlled toeffectively inhibit the longitudinal spherical aberration, theastigmatism aberration and the variation of the distortion aberration.Further, as shown by the imaging quality data provided for eachembodiment, the distance between the 470 nm, 555 nm and 650 nmwavelengths may indicate that focusing ability and inhibiting abilityfor dispersion is provided for different wavelengths.

According to above illustration, the optical imaging lens of the presentdisclosure may provide an effectively shortened optical imaging lenslength while maintaining good optical characteristics, by controllingthe structure of the lens elements as well as at least one of theinequalities described herein.

While various embodiments in accordance with the disclosed principlesbeen described above, it should be understood that they are presented byway of example only, and are not limiting. Thus, the breadth and scopeof exemplary embodiment(s) should not be limited by any of theabove-described embodiments, but should be defined only in accordancewith the claims and their equivalents issuing from this disclosure.Furthermore, the above advantages and features are provided in describedembodiments, but shall not limit the application of such issued claimsto processes and structures accomplishing any or all of the aboveadvantages.

Additionally, the section headings herein are provided for consistencywith the suggestions under 37 C.F.R. 1.77 or otherwise to provideorganizational cues. These headings shall not limit or characterize theinvention(s) set out in any claims that may issue from this disclosure.Specifically, a description of a technology in the “Background” is notto be construed as an admission that technology is prior art to anyinvention(s) in this disclosure. Furthermore, any reference in thisdisclosure to “invention” in the singular should not be used to arguethat there is only a single point of novelty in this disclosure.Multiple inventions may be set forth according to the limitations of themultiple claims issuing from this disclosure, and such claimsaccordingly define the invention(s), and their equivalents, that areprotected thereby. In all instances, the scope of such claims shall beconsidered on their own merits in light of this disclosure, but shouldnot be constrained by the headings herein.

1. An optical imaging lens, sequentially from an object side to an imageside along an optical axis, comprising first, second, third, fourth,fifth and sixth lens elements, each of said first, second, third,fourth, fifth and sixth lens elements having refracting power, anobject-side surface facing toward said object side and an image-sidesurface facing toward said image side, wherein: said first lens elementhas a positive refracting power; said object-side surface of said secondlens element comprises a convex portion in a vicinity of a periphery ofsaid second lens element; said object-side surface of said third lenselement comprises a convex portion in a vicinity of a periphery of saidthird lens element; the material of said fourth lens element is plastic;the material of said fifth lens element is plastic; said object-sidesurface of said sixth lens element comprises a concave portion in avicinity of a periphery of said sixth lens element, and the image-sidesurface of said sixth lens element comprises a convex portion in avicinity of a periphery of said sixth lens element; said optical imaginglens comprises no other lenses having refracting power beyond saidfirst, second, third, fourth, fifth and sixth lens elements; aneffective focal length of said optical imaging lens is represented byEFL, and a distance between said object-side surface of said first lenselement and an image plane along the optical axis is represented by TTL,and EFL and TTL satisfy the equation: EFL/TTL 1; a maximum value of airgaps between two adjacent lens elements of said first, second, third,fourth, fifth and sixth lens elements is represented by Gmax, and TTLand Gmax satisfy the equation: TTL/Gmax≦7.65, and a central thickness ofsaid third lens element along the optical axis is represented by T3 anda central thickness of said sixth lens element along the optical axis isrepresented by T6, and TTL, T3 and T6 satisfy the equation:TTL/(T3+T6)≦6.5.
 2. The optical imaging lens according to claim 1,wherein a back focal length of said optical imaging lens is representedby BFL, a central thickness of said second lens element along theoptical axis is represented by T2, and an air gap between said fifthlens element and said sixth lens element along the optical axis isrepresented by G56, and BFL, T2, and G56 satisfy the equation:BFL/(T2+G56)≧1.5.
 3. The optical imaging lens according to claim 1,wherein a central thickness of said fourth lens element along theoptical axis is represented by T4, and EFL and T4 satisfy the equation:EFL/T4≧8.5.
 4. The optical imaging lens according to claim 1, wherein aback focal length of said optical imaging lens is represented by BFL, anair gap between said second lens element and said third lens elementalong the optical axis is represented by G23, and an air gap betweensaid fifth lens element and said sixth lens element along the opticalaxis is represented by G56, and BFL, G23, and G56 satisfy the equation:BFL/(G23+G56)≧1.5.
 5. The optical imaging lens according to claim 1,wherein a central thickness of said fourth lens element along theoptical axis is represented by T4, and wherein TTL and T4 satisfy theequation: TTL/T4≧9.
 6. The optical imaging lens according to claim 1,wherein an air gap between said third lens element and said fourth lenselement along the optical axis is represented by G34, a centralthickness of said fifth lens element along the optical axis isrepresented by T5, and G34, T5, and T6 satisfy the equation:(G34+T5)/T6≦11.5.
 7. The optical imaging lens according to claim 1,wherein an air gap between said third lens element and said fourth lenselement along the optical axis is represented by G34, and T3, G34, andT6 satisfy the equation: (T3+G34)/T6≦11.5.
 8. The optical imaging lensaccording to claim 1, wherein an air gap between said third lens elementand said fourth lens element along the optical axis is represented byG34, and G34 and T6 satisfy the equation: G34/T6≦7.5.
 9. The opticalimaging lens according to claim 1, wherein a central thickness of saidsecond lens element along the optical axis is represented by T2, acentral thickness of said fifth lens element along the optical axis isrepresented by T5, and T2, T5, and T6 satisfy the equation:(T2+T5)/T6≦6.
 10. The optical imaging lens according to claim 1, whereina maximum value of the air gaps between two adjacent lens elements ofsaid first, second, third, fourth, fifth and sixth lens elements isrepresented by Gmax and an air gap between said second lens element andsaid third lens element along the optical axis is represented by G23,and Gmax and G23 satisfy the equation: Gmax/G23≧2.5.
 11. The opticalimaging lens according to claim 1, wherein an air gap between said firstlens element and said second lens element along the optical axis isrepresented by G12, and G12, T3, and T6 satisfy the equation:(G12+T3)/T6≦6.5.
 12. The optical imaging lens according to claim 1,wherein an air gap between said fourth lens element and said fifth lenselement along the optical axis is represented by G45, an air gap betweensaid fifth lens element and said sixth lens element along the opticalaxis is represented by G56, and G45, G56, and T6 satisfy the equation:(G45+G56)/T6≦10.
 13. The optical imaging lens according to claim 1,wherein an air gap between said third lens element and said fourth lenselement along the optical axis is represented by G34, and G34 and T6satisfy the equation: (G34+T6)/T6≦8.5.
 14. The optical imaging lensaccording to claim 1, wherein a central thickness of said second lenselement along the optical axis is represented by T2, an air gap betweensaid fourth lens element and said fifth lens element along the opticalaxis is represented by G45, and T2, G45, and T6 satisfy the equation:(T2+G45)/T6≦7.5.
 15. The optical imaging lens according to claim 1,wherein a maximum value of the air gaps between two adjacent lenselements of said first, second, third, fourth, fifth and sixth lenselements is represented by Gmax, an air gap between said first lenselement and said second lens element along the optical axis isrepresented by G12, and an air gap between said second lens element andsaid third lens element along the optical axis is represented by G23,and Gmax, G12, and G23 satisfy the equation: Gmax/(G12+G23)≧2.5.
 16. Theoptical imaging lens according to claim 1, wherein a sum of the centralthicknesses of said first, second, third, fourth, fifth and sixth lenselements is represented by ALT, an air gap between said first lenselement and said second lens element along the optical axis isrepresented by G12, and ALT, G12, and T6 satisfy the equation:ALT/(G12+T6)≦11.
 17. The optical imaging lens according to claim 1,wherein a sum of all air gaps between said first, second, third, fourth,fifth and sixth lens elements along the optical axis is represented byGaa, a central thickness of said second lens element along the opticalaxis is represented by T2, and Gaa, T2, and T6 satisfy the equation:Gaa/(T2+T6)≦5.5.
 18. (canceled)
 19. The optical imaging lens accordingto claim 1, wherein an air gap between said second lens element and saidthird lens element along the optical axis is represented by G23, andEFL, G23, and T3 satisfy the equation: EFL/(G23+T3)≧5.5.
 20. The opticalimaging lens according to claim 1, wherein an air gap between said firstlens element and said second lens element along the optical axis isrepresented by G12, and a central thickness of said second lens elementalong the optical axis is represented by T2, and G12, T6, and T2 satisfythe equation: (G12+T6)/T2≧2.